Submission #959559

#	Time	Username	Problem	Language	Result	Execution time	Memory
959559		SuPythony	Bosses (BOI16_bosses)	C++17	100 / 100	964 ms	1092 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

vector<vector<int>> al(5001, vector<int>()), al2;
vector<ll> sub;

void dfs(int i) {
    if (al2[i].empty()) return;
    for (int v: al2[i]) {
        dfs(v);
        sub[i]+=sub[v];
    }
}

int main() {
    int n; cin>>n;
    for (int i=1; i<=n; i++) {
        int k; cin>>k;
        while (k--) {
            int v; cin>>v;
            al[v].push_back(i);
        }
    }
    ll ans=1e18;
    for (int i=1; i<=n; i++) {
        sub.assign(n+1,1);
        al2.assign(n+1, vector<int>());
        vector<int> vis(n+1,0);
        queue<int> q;
        q.push(i);
        vis[i]=1;
        int nvis=1;
        while (!q.empty()) {
            int u=q.front(); q.pop();
            for (int v: al[u]) {
                if (vis[v]) continue;
                vis[v]=1;
                nvis++;
                al2[u].push_back(v);
                q.push(v);
            }
        }
        if (nvis<n) continue;
        dfs(i);
        ll s=0;
        for (int i=1; i<=n; i++) s+=sub[i];
        ans=min(ans,s);
    }
    cout<<ans;
    return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33